A triangle is a three-sided closed figure. There are three types of triangles. A triangle with three equal sides and three equal angles is called equilateral. A triangle with two equal sides and two equal angles is called isosceles. A triangle with no equal sides and no equal angles is called scalene.
Area of Triangle
The area of a triangle is found by taking 1/2 of the product of the base and height (bh). The height (also known as the altitude) is defined as a line going from the tallest point of the triangle to the base at a right (90 degrees) angles. Height may be inside triangles, outside, triangles, or along the side of a triangle.
Right Triagles
A triangle with a 90- degree angle is called a right triangle.
Pythagorean Theorem
Within right triangles only, the sides are in a ratio of a2 + b2 = c2, where a and b are the sides of the triangle and c is its hypotenuse. This formula is called the Pythagorean Theorem.